如何使用PHP将XFDL解码为XML

I have been scouring the internet trying to figure this one out. Any ideas would help. I'm trying to take an .xfdl file (base64gzip of XML) from my server and convert it to .xml with PHP for viewing and modification but, I can't see to figure out this process. I've seen people try to with Ruby but, I don't know any Ruby. If no one can help, I guess I'll be learning Ruby hahaha! Thanks in advanced. Also, I have looked through this website and couldn't find any php examples of this.I have been scouring the internet trying to fig